Stephen Hawking Gave Filmmakers A Priceless Gift After Watching The New Movie About His Life

Focus Features/"The Theory of Everything"Eddie Redmayne in "The Theory of Everything," based on the life of Stephen Hawking.

Actor Eddie Redmayne, 32, was lucky to get the role of famed physicist Stephen Hawking in the new movie "The Theory of Everything" - but it came with a lot of pressure.

Hawking himself , now 72, would be judging the young actor's performance. 

Hawking trekked to London to screen the film ahead of its November 7th release. Before watching the movie, Redmayne told Variety the cosmologist warned: "I'll let you know what I think - good or otherwise.' I said, 'Stephen, if it's otherwise, you don't need to go into details.'"

When the film screening was complete, Hawking was overcome with emotion (via Variety):

AP Photo/Ted S. WarrenThe real Stephen Hawking thought the film was like "watching himself."

After the lights came up, a nurse wiped a tear from Hawking's eye. He called the film 'broadly true,' and even celebrated with the film's director James Marsh and screenwriter Anthony McCarten at a bar where he sipped champagne from a teaspoon. 'He emailed us,' Marsh says, 'and said there were certain points when he thought he was watching himself.'

Hawking was so happy with the movie that he told filmmakers he would allow them to swap the synthetic voice they had been forced to create and replace it with his own, trademarked computerized version. "We spent a lot of time and money trying to reproduce the voice, but we never got it," McCarten told Variety.

"The Theory of Everything"Hawking was so thrilled with the movie he gave his blessing for filmmakers to use his trademarked computer voice.

Redmayne was thrilled after he heard about Hawking's offer, believing it was a stamp of approval on a performance he still questioned.

"You're just hoping to get there," Redmayne said. "Yet there's this constant frustration - it's always underwhelming, because you never quite make it. But with his specific voice, it's an actor's dream. You're one step closer to the truth."

Hawking's "voice," as he explains on his website, is a computer-based communication system that has been provided by Intel since 1997. To learn more about how it works, click here.

"The Theory of Everything" has raked in over $23 million at the box office since its release last month and is already getting Oscar buzz.

Watch the trailer below: